Ahtract-A desktop personal computer can be greatly extended in usefulness by attaching it to a local area network and implementing a full set of network protocols, just as one might provide for a mainframe computer.. Such protocols are a set of tools that allow the desktop computer not just to access data elsewhere, but to participate in the computing milieu much more intensely. There are two challenges to this proposal. First, a personal computer may often be disconnected from the network, sq it cannot track the network state and it must be able to, discover and resynchronize with that state very quickly. Second, full protocol implementations ns have often been large and slow, two attributes that could be fatal in a small computer. This paper reports a network implementation for the IBM Personal Computer that uses several performance-oriented design techniques with wide applicability: an upcall/downcall organization that simplifies structure; implementation layersthat do not always coincide with protocol specification layers; copy minimization; and tailoring of protocol implementations with knowledge of the application that will use them. The size and scale of the resulting package of programs, now in use in our laboratory for two years, is quite reasonable for a desktop computer and the techniques developed are applicable to a wider range of network protocol designs. OVERVIEW T' HIS paper describes the issues encountered and lessons learned in the design, implementation, and deployment of a full-scale network protocol implementation for a desktop personal computer. The protocol family implemented was the United States. Department of Defense standard Transmission Control Protocol and Internet Protocol [l], [2]. The desktop computer was the IBM Personal Computer attached to one of several local area networks: Ethernet, PRONET, and an RS-232 asynchronous serial line network. The collection of programs is known as PCIP. The project was undertaken in December 1981, shortly after the IBM PC became available. Initial implementations using an RS-232 asynchronous serial line network were, in operation in the Summer of 1982, and a complete implementation for the Ethernet was placed in service at M.I.T. in January 1983. Since that time the implementation has been polished, drivers for other networks have been added, the software has been used in many applications unrelated to network research, and the programs have been placed in service at several other sites. Enough experience with the implementation has been gained to provide a convincing demonstration that the techniques used were successful. This work was supported in part by IBM Corporation under a general 56 kbits/s, few attached systems can sustain a data rate grant .for computer science research to M.I.T. Many of the ideas were much above 15 kbitsls. When those Same systems are borrowed and some of the code was ported from projects supported by the Defense Advanced Research Projects Agency. attached to local area networks that can accept data rates The authors ar...
Two sessions were held on the general topic of debugging methodology. Both were moderated by R. Stockton Gaines. During the first session five speakers presented short talks on their workshop submissions. Each talk was followed by a brief question and answer period. The format of the second session was that of an open discussion. The talks presented in the first session have been briefly summarized. The remaining notes of these two sessions have been arranged topically rather than chronologically.
The ClubStead is a novel type of offshore floating platform, which provides comfortable and safe ocean-going dwellings for communities of a few hundred people. The prospect of large, unclaimed ocean spaces has encouraged people to consider developing sea-going settlements. A number of attempts have been made on former oil platforms or cruise ships. But these structures are not designed for permanent living at sea and fall short of meeting dwellers’ expectations. Efforts to build large, spacious floating living facilities have struggled to balance cost-effectiveness and structural integrity. This paper describes an innovative, cost-efficient solution to maximize space on offshore structures. To control the cost, the submerged volume of the floater is minimized. To maximize comfort, the available living surface area is also maximized, while the motions of the platform are limited. The proposed solution is based on the principles of tensegrity, which are commonly used on bridges. Cable stays are tensioned at the top of towers to support the weight of both light and cantilevered top-sides. The floater is column-stabilized with four submerged columns. A feasibility study was performed for the design of a Clubstead based off the coast of California. The platform is dynamically positioned and can house up to 270 people. Due to its primary function, as a floating living facility, the architectural design and the engineering studies are intertwined. Iterations are necessary to determine the global characteristics of the ClubStead. The buildings and living spaces are arranged by an architect, within specific offshore-related constraints. The resulting payload is calculated and thus used in the design basis to perform the engineering analysis. The feasibility study focuses on survivability and passenger comfort to assess the novel design. The survivability analysis is based on structural strength and motion predictions in a 100-year storm. Passenger comfort is evaluated in operational conditions.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.